w/3+6=21 - solution

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Solution for w/3+6=21 equation:

w in (-oo:+oo)

w/3+6 = 21 // - 21

w/3-21+6 = 0

1/3*w-15 = 0 // + 15

1/3*w = 15 // : 1/3

w = 15/1/3

w = 45

w = 45

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